/***
 * ASM: a very small and fast Java bytecode manipulation framework
 * Copyright (c) 2000-2011 INRIA, France Telecom
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.sinosoft.monitor.org.objectweb.asm.util;

import com.sinosoft.monitor.org.objectweb.asm.AnnotationVisitor;
import com.sinosoft.monitor.org.objectweb.asm.Attribute;
import com.sinosoft.monitor.org.objectweb.asm.FieldVisitor;
import com.sinosoft.monitor.org.objectweb.asm.Opcodes;

/**
 * A {@link FieldVisitor} that checks that its methods are properly used.
 */
public class CheckFieldAdapter extends FieldVisitor {

	private boolean end;

	/**
	 * Constructs a new {@link com.sinosoft.monitor.com.sinosoft.monitor.org.objectweb.asm.util.CheckFieldAdapter}. <i>Subclasses must not use
	 * this constructor</i>. Instead, they must use the
	 * {@link #CheckFieldAdapter(int, FieldVisitor)} version.
	 *
	 * @param fv the field visitor to which this adapter must delegate calls.
	 */
	public CheckFieldAdapter(final FieldVisitor fv) {
		this(Opcodes.ASM4, fv);
	}

	/**
	 * Constructs a new {@link com.sinosoft.monitor.com.sinosoft.monitor.org.objectweb.asm.util.CheckFieldAdapter}.
	 *
	 * @param api the ASM API version implemented by this visitor. Must be one
	 *            of {@link Opcodes#ASM4}.
	 * @param fv  the field visitor to which this adapter must delegate calls.
	 */
	protected CheckFieldAdapter(final int api, final FieldVisitor fv) {
		super(api, fv);
	}

	@Override
	public AnnotationVisitor visitAnnotation(final String desc,
	                                         final boolean visible) {
		checkEnd();
		CheckMethodAdapter.checkDesc(desc, false);
		return new CheckAnnotationAdapter(super.visitAnnotation(desc, visible));
	}

	@Override
	public void visitAttribute(final Attribute attr) {
		checkEnd();
		if (attr == null) {
			throw new IllegalArgumentException(
					"Invalid attribute (must not be null)");
		}
		super.visitAttribute(attr);
	}

	@Override
	public void visitEnd() {
		checkEnd();
		end = true;
		super.visitEnd();
	}

	private void checkEnd() {
		if (end) {
			throw new IllegalStateException(
					"Cannot call a visit method after visitEnd has been called");
		}
	}
}
